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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5091ad6351c6e4b14a07cb112e1cfdf6a01d53c7cad0ff112b13be11b049de' 
  AND token = 'jQpfKvKLMOXP9Y2POVeUzy7r2NwpW3oogshwjr+X7yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}